Disazo dye.



lUNrrnn STATES T NT wi PAUL JULIUS, OF LUDWIGSHAFEN, GERMANY, ASSIGNOR TO BADISOHE ANILIN & SODA FABRIK, OF SAME PLACE.

DlSAZO DYE.

srncrnrcnrron forming m of Letters Patent No. 677,229, dated, Z-Tune 25, 1901.

Application filed February 25, 1901. Serial No. 48,782. (No specimens.)

To all whom it ntay concern.-

Be it known that I, PAUL JULIUS, doctor of philosophy and chemist, a subject of the Elnperor of Austi'ia-I'Iungary, residing at Ludwigshafen-omthe-Rhine, in the Kingdom of Bavaria and Empire of Germany, have invented new and usefullmprovements in Disazo Dyes, of which the following is a specification.

If the nitro-amido-phenol-sulfo-acid to which the constitution SOLE is attributed that is, the para-sulfo-acid of ortho-nitro-ortho-amido-phenol (see Letters Patent granted to me, No. 644,234, dated the 27th of February, 1900)be reduced, the corresponding diamido-phenol-sulfo-acid is obtained. Upon diazotizing this diamido-phenol-sulfo-acid a tetrazo compound results, and I have discovered that upon combining this tetrazo compound first with one of the components hereinafter set forth and then with a second of such components new mixed or unsymmetrical disazo coloring-matters are obtained possessing excellent qualities. The said components are beta-naphthol, 2.6 betanaphthol-monosulfo-acid,2.7 dihydroxy-naphthaleue, and the like. The coloring-matters so obtained dye wool from the acid-bath, givin g shades which vary from bluish-violet to greenish-blue, and upon treating the dyed application is the specific mixed disazo coloring-matter which can be obtained from one molecular proportion each of 2.7 dihydroxy naphthalene and beta-naphthol.

Although I do not claim the process for the production of the diamido-phenol-sulfo-acid, I give the following example of a method by which it may be obtained for the sake of clearness. The parts are by weight.

Example 1: Dissolve about four hundred and sixty-eight L68) parts of orthonitroortho-amido-phenol-para-sulfo-acid in two thousand (2,000) parts of hot water. Stir the solution and slowly add about seven hundred and fifty (7 parts of zinc-dust, and subsequently, in small portions at a time, about two thousand (2,000) parts of hydrochloric acid, (containing about thirty-two per cent. of real H01.) Allow the solution to cool, collect the precipitate, and redissolve it in hy drochloric acid. Filter the solution and neutralize it exactly with carbonate of soda. The desired diamido-phenol-sulfo-=acid separates out as free acid in the form of a slightly-yellowish crystalline precipitate. Collect by filtering, wash with cold water, and dry carefully.

The following example will serve to illustrate the manner in which my invention can be carried into practical effect and new color= ing-matter obtained. The parts are by weight.

Example 2: Prepare a solution of about two hundred and four (204:) parts of the diamidophenol-para-sulfo-acid obtained as described in the foregoing example in three thousand (3,000) parts of water containing four hundred and sixty (460) parts of hydrochloric acid, (containing thirty-two per cent. of H01.) To this solution when cold add gradually one hundred and thirty-eight (138) parts of sodium nitrite dissolved in four hundred (400) parts of water. The tetrazo compound is soon formed and partially separates out. Run the solution or suspension of the tetrazo compound thus obtained into a solution of one hundred and forty-four (144:) parts of betanaphthol and forty (40) parts of solid caustic soda in one thousand five hundred (1,500) parts of water. Stir the mixed solutions un til combination is complete, which is the case ary 21, 1901; but what I wish to claim in this in a short time. The intermediate product obtained separates out as a red precipitate. Filter it oif, stir it up into a paste with water, and run it into a solution of one hundred and eighty (180) parts of 2.7 dihydroxy-naphthalene and-two hundred (200) parts of "soda in three thousand five hundred (3,500) parts of water. \Varm the solution or suspension to a temperature of forty (40) degrees centigrade and stir until combination is complete. The coloring-matter separates out. ofi, press, and dry.

My new coloring-matter thus obtained is soluble in water, giving a blue soluti0n,which upon the addition of a little carbonate-ofsoda solution is hardly changed and upon the addition of a little caustic-soda solution becomes redder. If hydrochoric acid be added to the aqueous solution, a red precipitate is formed and the solution of the coloring-matter in concentrated sulfuric acid is violet. The coloring-matter can readily be reduced, for instance, with stannous chlorid in hydrochloric-acid solution, with zinc-dust and ammonia, or with other suitable reducing agents. WVhen suitably reduced, three Filter it reduction productsnamel y, the above-mentioned diamido-phenol-sulfo-acid, amido-dihydroxy-naphthalene, and amido-naphthol are produced and can be recognized.

Now What I claim is The new disazo coloring-matter which can be obtained from diamido-pheuol-sulfo-acid, beta-naphthol and 2.7 dihydroxy-naphtlialene which is soluble in water giving a blue solution which is hardly changed upon the addition of sodium-carbonate solution and becomes redder upon the addition of caustic soda solution and in which a red precipitate is formed upon the addition of hydrochloric acid and gives a violet solution in concentrated sulfuric acid, and which upon suitable reduction yields diamido-phenol-sulfo-acid, amido-dihydroXy-naphthalene, and amidonaphthol, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

4 PAUL JULIUS. \Vitnesses':

PAUL SEIDEL, JOHN L. HEINKE. 

